JPH08329531A - Disk device - Google Patents

Abstract

PURPOSE: To sufficiently maintain the strength in the case of adhering and fixing a disk substrate and a hub structural body by an adhesive and the parallelism between the disk substrate and the hub structural body. CONSTITUTION: The disk device 10 is composed of the disk substrate 11 which is bored with a center hole 12 at the center of an inner peripheral holding part and is formed with an information recording signal layer on one main surface side, a metallic plate 15 which is bored with a spindle hole 16 at its center and the hub structural body 13 which has a mounting member 14 integrally formed with the metallic plate 15. The material member 14 of the hub structural body 13 is provided with a mounting reference plane 26 and a packing part 22 constituting a slope to make the thickness of an outer peripheral part 24 larger than the thickness of the inner peripheral part 23 on the inner peripheral thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device such as an optical disk or a magneto-optical disk in which a predetermined information signal is recorded, and in particular, writing and / or reading of a predetermined information signal is performed by using optical means. The present invention relates to an optical disk device.

[0002]

2. Description of the Related Art An optical disk is a recording medium on which desired information signals such as a tone signal and a video signal are recorded or can be recorded at a high density. It is rotatably driven by being supported by a disk table of a recording and / or reproducing apparatus. Then, in the state where the optical disc is driven to rotate at a high speed, the information signal recorded in the information recording signal portion formed on the main surface is reproduced by the laser light emitted from the optical pickup device. An optical disc capable of recording an information signal is magnetically modulated in accordance with an information signal to be recorded by an external magnetic field generator in a state where the laser beam emitted from the optical pickup device is applied to the information recording signal section. A desired information signal is recorded by applying an external magnetic field.

As described above, in a recording and / or reproducing apparatus using an optical disk or a magneto-optical disk as a recording medium for writing and / or reading a predetermined information signal by using optical means, several hundreds of minutes per minute. The disc is rotated at an extremely high speed of several thousand to several hundred revolutions to write and / or read the predetermined information signal. Therefore,
The recording and / or reproducing apparatus for the predetermined information recording signal rotates at a high speed in order to accurately read the information recording signal, to accurately irradiate the laser beam from the optical pickup device, and to guarantee a high-speed rotation of the disc. Means are provided for integrally coupling the disc to the disc rotation drive.

As means for integrally coupling the disc to the disc rotation drive device, a magnet is provided on the disc rotation drive device side, a hub having a metal plate is attached to the disc side, and the metal plate is magnetized by the magnet. A magnet catching system is adopted in which the disc and the disc rotation drive device are integrated by attracting the disc.

As shown in FIGS. 5 and 6, this disc device 50 has a disc substrate in which a center hole 52 is formed at the center of an inner peripheral holding portion and an information recording signal layer is formed on one main surface side. 51, a metal plate 55 having a spindle hole 56 at the center thereof, and a mounting member formed integrally with the metal plate 55 to close the center hole 52 and to be disposed on one main surface side of the disk substrate 51. 54 and a disk substrate 51
And a hub structure 53 that is joined to the adhesive surface 60 of the inner peripheral holding portion.

The disk substrate 51 is formed into a disc shape by a glass plate or a transparent synthetic resin plate such as a polycarbonate resin. A center hole 52 is provided in the center of the disk substrate 51, and an information signal recording portion for recording an information signal is concentrically formed on one main surface with the center hole 52 as the center.

As shown in FIG. 6, the hub assembly 53 has a flange portion 57 formed on the outer peripheral portion of a metal plate 55 having a spindle hole 56 with which a center spindle 91 of a disk rotation driving device 90 is engaged. A synthetic resin such as a polycarbonate resin is outsert-molded, and is composed of the metal plate 55 and an attachment member 54 integrated with the metal plate 55.

As shown in FIG. 6, in the disk device 50 having the above-described structure, the spindle hole 56 of the metal plate 55 is engaged with the center spindle 91 of the disk rotation driving device 90, and the hub structure 53 is attached. The disk table 92 is rotatably mounted integrally with the center spindle 91, and the metal plate 55 is magnetically attracted by a magnet 93 arranged on the inner peripheral side of the disk table 92 to It is mounted so as to be rotatable integrally with 92.

[0009]

In the disk device 50 configured as described above, the inner peripheral holding portion of the disk substrate 51 is provided with the adhesive surface 60, and the inner peripheral holding portion of the disk substrate 51 of the mounting member 54 is provided. A mounting reference surface 61 is provided on the opposite side. The adhesive surface 60 and the mounting reference surface 61
Are configured to be horizontal to each other and are butt-joined to each other via an adhesive 59.

The disk device 50 configured as described above
As shown in FIG. 5, when the hub structure 53 is bonded and joined, problems such as uneven coating of the adhesive 59 occur. Therefore, the adhesive surface 60 and the attachment reference surface 61 cannot be butt-bonded and joined in a state of being in close contact. Also, the adhesive 59
Leaks from the outer peripheral surface of the attachment reference surface 61 and impairs the external appearance of the disk device 50. Further, in the disk device 50, the mounting surface of the hub structure 53 on the disk table 92 is not placed on the disk table 92 in a state in which the mounting surface is parallel to the main surface of the disk substrate 51.

In such a disk device 50, the hub structure 53 may be easily dropped from the disk substrate 51 by repeating the loading / unloading operation of the disk table 92 of the rotary drive device 90 of the disk device 50. . Further, when the disc device 50 is mounted on the disc rotation drive device 90 and rotated, the disc substrate 5 is moved.
1 cannot rotate horizontally with respect to the disk table 92, which causes so-called surface deviation (SKEW). As a result, the recording and / or reproducing apparatus may not be able to write and / or read the information signal with good recording / reproducing characteristics.

In order to solve such a problem, FIG.
The disk device 70 shown in FIG. That is,
The disk device 70 has a center hole 7 at the center of the inner circumference holding portion.
2, a disk substrate 71 having an information recording signal layer formed on one main surface side thereof, a metal plate 75 having a spindle hole 76 at the center thereof, and a center hole integrally formed with the metal plate 75. A hub assembly 73 is formed of a mounting member 74 that is disposed on one main surface side of the disk substrate 71 by closing 72, and is joined to an adhesive surface 80 of an inner circumference holding portion of the disk substrate 71. .

The disk substrate 71 is formed into a disk shape by using a glass plate or a transparent synthetic resin plate such as a polycarbonate resin. Disk substrate 7
In No. 1, a center hole 72 is provided in the central portion, and an information signal recording portion for recording an information signal is concentrically formed on one main surface with the center hole 72 as the center.

The hub assembly 73 is a disk rotation driving device 9
Spindle hole 7 with which 0 center spindle 91 is engaged
The metal plate 75 is formed with a mounting member 74 integrated with the metal plate 75 by outsert molding a synthetic resin such as a polycarbonate resin on a flange 77 formed on the outer periphery of the metal plate 75.

The disk device 70 includes a disk substrate 7
An adhesive surface 80 is provided on the inner peripheral holding portion 1. Also,
The disk device 70 includes a mounting member 74, a disk substrate 7 and a mounting member 74.
A concave ring-shaped groove portion 83 is provided on the opposite side of the inner circumference holding portion of No. 1, and the inner circumference mounting reference surface 8 is provided on both sides of this groove portion 83.
1. A reference surface 82 for mounting the outer circumference is provided. Then, the disk substrate 71 and the mounting member 74 are adhesively joined by injecting the adhesive 79 only into the groove portion 83 and abutting the mounting member 74 on the bonding surface 80.

The disk device 70 configured as described above
According to the hub assembly 73, the adhesive surface 80 and the attachment member 7 are
4 and 4 can be abutted and joined without interposing an adhesive 79. Therefore, the parallelism with respect to the disc substrate 71 can be sufficiently maintained.

However, in the disk device 70, when the amount of the adhesive 79 applied to the groove portion 83 becomes excessive, the adhesive 79 leaks to the outer peripheral mounting reference surface 82 side and is not butt-joined on the same surface. Table 9
It will no longer be placed parallel to 2.

Further, in the disk device 70, if the amount of the adhesive 79 applied to the groove portion 83 is insufficient, the inside of the groove portion 83 becomes hollow and sufficient adhesive strength cannot be obtained. Therefore, the disk device 70 is
By repeating the loading / unloading operation of the rotary drive device 90 with respect to the disk table 92, the hub structure 73 may be easily dropped from the disk substrate 71. Therefore, even in such a disk device, the problem cannot be solved reliably.

Therefore, according to the present invention, the hub structure can be attached to the disk substrate without being affected by the amount of adhesive applied, etc., and the accuracy of attachment of the hub structure to the disk substrate can be improved to improve the adhesive strength. It is proposed for the purpose of providing a disk device designed.

[0020]

DISCLOSURE OF THE INVENTION A disk device according to the present invention includes a disk substrate having a center hole formed in the center of an inner circumference holding portion and an information recording signal layer formed on one main surface side. A metal plate having a spindle hole formed in the center thereof, and a mounting member which is integrally formed with the metal plate and closes the center hole and is disposed on one main surface side of the disc substrate. And a hub structure joined to the adhesive surface of the inner circumference holding portion. In the disk device, a mounting reference surface for mounting the disk substrate is provided on the surface of the mounting member facing the bonding surface of the inner peripheral holding portion of the disk substrate, and the bottom surface is on the inner peripheral side in the inner peripheral area of the reference surface. From the outer peripheral side toward the outer peripheral side is provided with a filling portion that is an inclined surface that is inclined so as to increase in thickness, and the mounting member that constitutes the hub structure,
A fitting portion fitted into the center hole of the disk substrate is integrally formed, and a clearance is formed between the fitting portion and the inner wall.

[0021]

According to the disk device of the present invention configured as described above, the adhesive filled in the filling portion forming the inclined surface having the thickness of the outer peripheral portion larger than the thickness of the inner peripheral portion is along the inclined surface. It spreads and spreads inside the lever filling section. Therefore, the adhesive strength between the disk substrate and the hub structure is increased by increasing the adhesive area of the adhesive, and moreover, the disk substrate and the hub structure are attached to the attachment reference surface with good parallelism.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk device 10 of an embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the disk device 10 includes a disk substrate 11 having a center hole 12 at the center of an inner circumference holding portion and an information recording signal layer formed on one main surface side, and a spindle hole at the center. A hub structure 13 including a metal plate 15 having a hole 16 formed therein and a mounting member 14 formed integrally with the metal plate 15 to close the center hole 12 and to be disposed on one main surface side of the disk substrate 11.
And is constituted by.

The disk substrate 11 is made of a glass plate or a transparent synthetic resin, such as polycarbonate resin, and has a disk shape. An inner circumference holding portion is formed in the central area of the disk substrate 11, and an information signal portion on which an information signal is recorded or is recorded is formed concentrically with the inner circumference holding portion. Also, the hub structure 1 is attached to the disk substrate 11.
A center hole 12 having an inner diameter sufficient for attaching 3 is formed.

As shown in FIGS. 2 and 3, the mounting member 14 has a bottomed cylindrical fitting portion 20 having an outer diameter substantially equal to the inner diameter of the center hole 12 of the disk substrate 11, and the fitting portion 20. A flange portion 19 is formed integrally with a synthetic resin material so as to extend over the entire circumference of the outer peripheral portion of the opening portion. The fitting portion 20 is the disk substrate 1
It has a height slightly larger than the thickness of 1.
The flange portion 19 is formed to have an outer diameter slightly smaller than the innermost peripheral portion of the information recording signal portion formed on the disk substrate 11.

The metal plate 15 is formed by punching a metal material such as a stainless steel plate (SUS-430) having a thickness of about 0.4 mm into a disc shape. And the metal plate 1
5 is formed into a disk shape having a concave bay shape as a whole by performing step bending on the outer peripheral edge side and providing the flange portion 18. The metal plate 15 is recorded and / or recorded at the center position.
Alternatively, a spindle hole 16 into which the center spindle on the reproducing apparatus side is fitted is provided.

The hub structure 13 is constructed by integrally forming the mounting member 14 by outsert molding a synthetic resin such as a polycarbonate resin on the outer peripheral portion of the metal plate 15. The disk device 10 is provided with an adhesive surface 27 for applying an adhesive 31 for adhesively bonding the mounting member 14 constituting the hub structure 13 to the inner peripheral holding portion of the disk substrate 11. Further, the mounting member 14 is provided with a filling portion 22 filled with the adhesive 31 and a mounting reference surface 26 when the hub structure 13 and the disk substrate 11 are bonded and joined as described later.

The mounting reference surface 26 is formed in a horizontal plane so as to be parallel to the mounting reference surface, which is a mounting surface on the disk table of the rotary drive for rotating the disk device 10 with high accuracy. The filling portion 22 is provided to fill the adhesive 31 for adhesively bonding the hub structure 13 to the disk substrate 11, and is formed in the attachment reference surface 26 in a ring shape. Further, the filling portion 22 is formed as an inclined surface so that the thickness of the outer peripheral portion 24 of the attachment reference surface 26 becomes gradually larger than that of the inner peripheral portion 23.

That is, as shown in FIG. 4, the filling portion 22 has a bottom surface formed into an inclined surface inclined from the inner peripheral portion 23 toward the outer peripheral portion 24, and the angle a of the inclined surface is 3 ° to 15 °. It is set in the range of about °. Also, the filling unit 2
2 has a depth with respect to the mounting reference surface 26 set in the range of about 0.5 mm to 1.5 mm. The angle a and the depth b of the filling portion 22 are set to minimize the amount of the adhesive 31 for adhering the mounting member 14 and the disk substrate 11 and shorten the curing time to maintain the manufacturing efficiency. It is a suitable range.

Further, the filling portion 22 has a ten-point average roughness (Rz) = roughness of the surface in order to increase the adhesive area between the disk substrate 11 and the mounting member 14 and improve the adhesive strength.
It is molded to have a thickness of about 10 μm. When the ultraviolet curable adhesive is used as the adhesive 31 when the disk substrate 11 and the hub structure 13 are adhesively bonded, the filling portion 22 has a surface close to a mirror surface in order to improve the light transmittance. It can also be molded.

The hub structure 13 constructed as described above is
It is mounted by bonding the mounting reference surface 26 to the bonding surface 27 of the inner circumference holding portion of the disk substrate 11 via the bonding material 31. For the adhesive 31, synthetic adhesives such as epoxy resin, urethane resin, cyanoacrylate, etc. are used in addition to the above ultraviolet curable adhesive.

By the way, in order to mount the hub structure 13 in the center hole 12 of the disk substrate 11, first, as shown in FIG. 2, the hub structure 13 of the disk substrate 11 is mounted.
The adhesive 31 is applied to the radial position corresponding to the filling portion 22 of FIG. The adhesive 31 is applied so as to be located within the width of the filling portion 22. Here, the hub structure 13 is bonded and fixed to the disk substrate 11 as shown in FIG. 1 by abutting the mounting reference surface 26 against the disk substrate 11 so that the adhesive 31 is adhered to the filling portion 22. .
At this time, the adhesive 31 has the angle a formed by the filling portion 22 between the slope of the adhesive surface 27 and the attachment reference surface 26.
It extends from the outer peripheral portion 24 toward the inner peripheral portion 23. Therefore, the disk substrate 11 and the hub structure 13 are bonded to each other with a large bonding area.

By the way, the disk substrate 11 and the hub assembly 1
3 between the fitting member 20 of the mounting member 14 and
A clearance 29 is provided. The clearance 29 absorbs the excessively filled adhesive 31 when the filling portion 22 is excessively filled. With the clearance 29, the hub structure 13 prevents the adhesive 31 from leaking to the side of the mounting reference surface 26 that is in contact with the disk substrate 11, and enables highly accurate mounting based on this mounting reference surface 26. Further, in the disk device 10, even when the amount of the adhesive 31 applied to the disk substrate 11 is slightly insufficient, the angle a formed between the slope formed on the bottom surface of the filling portion 22 and the attachment reference surface 26 is 3 mm. Since it is as small as about 15 ° to 15 °, the adhesive 31 is spread on the adhesive surface 27 and sufficient adhesive strength is secured.

Of course, the present invention is not limited to the disk device 10 of the present embodiment described above, and the filling portion 22 is provided in a flat hub structure having no fitting portion fitted in the center hole of the disk substrate. Alternatively, the invention is applicable to all disk devices that require the disk substrate 11 and the hub structure 13 to be adhesively bonded.

[0034]

As described in detail above, according to the disk device of the present invention, since the disk substrate and the hub structure are joined through the filling portion having a large adhesive bonding area, Since the adhesive is bonded with sufficient adhesive strength and the adhesive spreads with a uniform thickness, it is possible to sufficiently maintain the mounting accuracy on the disc substrate. .

Further, since the filling portion has a function of absorbing the adhesive, it becomes easy to control the coating amount of the adhesive,
The joining process of the disc substrate and the hub structure is rationalized.
In addition, the clearance provided in the mating part of the disk substrate and hub structure absorbs the excessively applied adhesive, preventing leakage to the mounting reference surface and maintaining high-precision mounting strength. it can.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of a disk device according to the present invention.

FIG. 2 is an exploded vertical cross-sectional view of a main part of a disk substrate and a hub structure of the disk device.

FIG. 3 is a plan view of a hub structure joined to the disk device.

FIG. 4 is a vertical cross-sectional view of a hub structure of the disk device.

FIG. 5 is a longitudinal sectional view of a main part of a conventional disk device.

FIG. 6 is a longitudinal sectional view of an essential part showing a state in which a conventional disk device is mounted on a rotation drive device.

FIG. 7 is a vertical cross-sectional view of a main part of another conventional disk device.

[Explanation of symbols]

 10 Disk Device 11 Disk Substrate 12 Center Hole 13 Hub Structure 14 Mounting Member 15 Metal Plate 16 Spindle Hole 22 Filling Part 23 Inner Circumference 24 Outer Circumference 26 Mounting Reference Surface 27 Adhesive Surface 29 Clearance 31 Adhesive

Claims (1)

[Claims] 1. A disk substrate having a center hole formed in the center of an inner circumference holding portion and an information recording signal layer formed on one main surface side thereof, and a metal plate having a spindle hole formed in the center thereof. A hub assembly which is integrally formed with this metal plate and which closes the center hole and is disposed on one main surface side of the disk substrate, and which is joined to the adhesive surface of the inner circumference holding portion. The mounting member is provided with a mounting reference surface for mounting with the disk substrate on the surface side facing the bonding surface of the inner circumference holding portion of the disk substrate, and the bottom surface is formed in the inner peripheral area of the reference surface. A filling portion that is formed as an inclined surface that increases in thickness from the peripheral side toward the outer peripheral side is provided, and the mounting member that constitutes the hub structure has a fitting portion that is fitted into the center hole of the disk substrate. And are integrally formed,
A disk device characterized in that a clearance is formed between the fitting portion and the inner wall.